Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by the proton-proton chain
Indicate whether the statement is true or false
False
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Nuclear Binding Energy: The carbon in our bodies was formed in nuclear reactions in long-dead stars. How much energy was released when the right number of 4He nuclei combined to make 12C? The mass of 4He is 3728.40 MeV/c2 and the mass of 12C is 11,177.93 MeV/c2.
A. 7.27 MeV B. 372 MeV C. 8.42 MeV D. 2.11 MeV
The planet ________ has the least variation in temperatures on the surface between day and night
A) Mars B) Earth C) Mercury D) Venus
When two identical waves undergo _______________ interference, the net amplitude is zero
Fill in the blank(s) with correct word
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. S1 and S2 are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the waves shown
arriving at P1 both arrive with amplitude A, the resultant amplitude at point P1 is
?
?
a.
0.
b.
.
c.
A.
d.
